Personally, I am more interested in improvements to asm.js like code. The limitations of asm.js, in particular the inability to allocate memory, greatly limits its usefulness for many applications.
I'm also interested in how asm.js could be improved in this regard without moving away from its existing barebones model. Would love to hear ideas.
I think the first thing we will see is shared array buffers between workers because games really need that.